A novel design for magneto-optical microscopy and its calibration

Abstract

Magneto-optical microscopy for superconducting films is always involved with extreme environments, such as high vacuum and cryogenic temperature. In these applications, devices of high spatial resolution and compact focusing are often required. Besides, the calibration process is also of importance for quantitative measurement of magnetic fields. In this paper, we present a comprehensive module design for magneto-optical microscopy based on a combination of an infinity optical system and dynamic sealing technique. This technique gets rid of the limit of distance between the sample and the microscope, and also guarantees no influences of windows on image resolution. In addition, for the problem of uneven illumination, a practical calibration method is presented and verified through experimental results. As a result, the novel module and its calibration method make the technology of magneto-optical microscopy have wide applications.